inet/getnetgrent.c

   1 /* Copyright (C) 1996-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <netdb.h>
  20 #include <stdlib.h>
  21 #include <libc-lock.h>
  22 #include <set-freeres.h>
  23
  24 /* Static buffer for return value.  We allocate it when needed.  */
  25 static char *buffer;
  26 /* All three strings should fit in a block of 1kB size.  */
  27 #define BUFSIZE 1024
  28
  29
  30
  31 static void
  32 allocate (void)
  33 {
  34   buffer = (char *) malloc (BUFSIZE);
  35 }
  36
  37 int
  38 getnetgrent (char **hostp, char **userp, char **domainp)
  39 {
  40   __libc_once_define (static, once);
  41   __libc_once (once, allocate);
  42
  43   if (buffer == NULL)
  44     {
  45       __set_errno (ENOMEM);
  46       return -1;
  47     }
  48
  49   return __getnetgrent_r (hostp, userp, domainp, buffer, BUFSIZE);
  50 }
  51
  52 weak_alias (buffer, __libc_getnetgrent_freemem_ptr)